HR: 0800h
AN: H31A-0122    [Abstracts]
TI: GRACE Satellite Data and In-Situ Water Level Time-Variation Correlation Analysis in the Amazon Basin.
AU: * Vaz de Almeida, F G
EM: flavio.guilherme@poli.usp.br
AF: Escola Politecnica da Universidade de Sao Paulo - Departamento de Eng. de Transportes _ Lab. Topografia e Geodésia, Av. Prof. Almeida Prado, Travessa 2, número 83, Sala 18, Sao Paulo, SP 05508- 070, Brazil
AU: * Vaz de Almeida, F G
EM: flavio.guilherme@poli.usp.br
AF: Laboratoire d'Etudes en Geophysique et Oceanographie Spatiales - Observatoire Midi- Pyrenees - UMP5566, 14, Av. Edouard Belin, Toulouse, 31400, France
AU: Ramillien, G
EM: guillaume.ramillien@legos.obs-mip.fr
AF: Laboratoire d'Etudes en Geophysique et Oceanographie Spatiales - Observatoire Midi- Pyrenees - UMP5566, 14, Av. Edouard Belin, Toulouse, 31400, France
AU: Blitzkow, D
AF: Escola Politecnica da Universidade de Sao Paulo - Departamento de Eng. de Transportes _ Lab. Topografia e Geodésia, Av. Prof. Almeida Prado, Travessa 2, número 83, Sala 18, Sao Paulo, SP 05508- 070, Brazil
AU: Calmant, S
AF: Institut de recherche pour le Developpement - IRD, SHIS - QL 16 - Conj.4 - Casa 8 Lago Sul, Brasilia, DF 71640-245, Brazil
AU: Cazenave, A
AF: Laboratoire d'Etudes en Geophysique et Oceanographie Spatiales - Observatoire Midi- Pyrenees - UMP5566, 14, Av. Edouard Belin, Toulouse, 31400, France
AU: Campos, I O
AF: Escola Politecnica da Universidade de Sao Paulo - Departamento de Eng. de Transportes _ Lab. Topografia e Geodésia, Av. Prof. Almeida Prado, Travessa 2, número 83, Sala 18, Sao Paulo, SP 05508- 070, Brazil
AU: Campos, I O
AF: Universidade Federal de Uberlandia, Av. João Naves de Ávila, 2121 Campus Santa Mônica - Bloco 1Y, Uberlandia, MG 38400-902, Brazil
AB: This work is based on a comparison between daily in situ water level time series measured at hydrometric stations of A.N.A. ground-based compared with vertically-integrated water height deduced from GRACE geoids computed by GRGS at 10-day interval, converted into equivalent water heights, over the Amazon basin for a approx. 4-year period (July-2002 to May-2006). A high correlation, 80 per cent in most cases, between water heights from GRACE-based and in situ water levels over the Amazon basin is detected. This correlation allows to define a local transfer function by adjusting a linear relationship between GRACE-based and in situ observations time-series. The slope of the transfer function decreases from upstream to downstream along the rivers and a high correlation of these coefficients of proportionality versus the distance from estuary is detected. Finally, an error budget is made taking satellite errors, leakage effect and errors from truncation of spectrum into account.
DE: 1217 Time variable gravity (7223, 7230)
DE: 1836 Hydrological cycles and budgets (1218, 1655)
DE: 1872 Time series analysis (3270, 4277, 4475)
SC: Hydrology [H]
MN: 2007 Fall Meeting